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Use the wonderful planning options of the Swiss rail system -- which also covers ferries and buses and just about everything else that moves in Switzerland and is public transportation!http://www.sbb.ch/en/home.html

You can take a boat ride along Lake Brienz and visit the Ballenberg Open Air Museum on the same day -- get off in Brienz and take a bus from just outside the ferry station.

The boat is just over an hour one way from Interlaken to Brienz, but you really want a full day at Ballenberg - it's quite spread out and there's a lot to see. You can get the Lucerne train direct from Brienz station (2 hours), but please note there's also a bus journey between Brienz and Ballenberg although it's not all that far.